Piston mechanism



Oct. 27-, 1925.

D. C. TEETOR PISTON MECHANISM Filed Aug. 23.

Hill W Patented Oct. 27, 1925. I

UNITED STATES Paranr PISTON MECHANISM.

Application filed August 323, 1924. Serial r10. ?33,702.

To all whom it may concern Be it known that I, DANIEL C. Tnnron, acitizen of the United States, residing at Indianapolis, in the county ofMarion and the State of Indiana, have invented a certain new and usefulImprovement in Piston Mechanism, of which the following is a full,clear, concise, and exact description.

My invention relates to mechanism employing pistons and piston rings.The invention comprises a hollow piston formed with a piston ringreceiving groove having passages establishing communication between thepiston interior and said groove, and a piston ring occupying said grooveand having an eaternal circumferentially extend ing groove in its outercircular face and in a zone between the flat faces of the ring, saidring also having passages formed in and extending across one fiat faceof the ringand of a depth to merge with the aforesaid groove in thering.

The lubricating oil is spread in the downward or inward movement of thepiston, the passages formed across one flat face of the ring directing aportion of the oil directly to the ring.receiving groove in the Y pistonwhence it passes to theupiston interior, the oil passing throughthocircumferential groove in the ring being lessened. This groove ispreferably in a zone spaced apart from both fiat faces of the ring toavoid a sharp scraping edge at a corner of the ring, the preferred formof ring of my invention not effecting too severe removal of oil. Thegroove in the ring being in'the outer circular face of the 'ring iscovered by the cylinder rather than by a wall of the ring receivinggroove in the piston, and the piston needs no chamfering to gain accessto the groove in the ring.

The invention will be more fully explained in connection with theaccompany ing drawing, showing the preferred embodiment, in whichFig. 1is a view of an engine:

portion showing parts in section and parts in elevation; Fig. 2 is asectional new on line 2-2 of Fig. 1; Fig. 3 is a sectional view ofparts, on a larger scale; and Fig. at is a perspective view of afragmentary portion of the ring.

The engine cylinder 1 may be of any suit abletype, the engine cylindercommun1cating at its inner end with the crankcasecon taininga bath oflubricating oil from which working parts of the engine are supplied.

' The piston 2 has one or more annular grooves 3, 4, that receive pistonrings 5, 6. lhe piston ring groove nearest the crank case preferablycontains the pistonring of my invention', it being unnecessary toprovide such a piston ring in the other piston ring receiv ing grooves.The innermost piston ring '6 is formed with an external annular groove 7in the outer circular face and in a zone of 55 the piston ring that ispar llel to and spaced apart from the inner and outer flat faces of. thering. Passages 8 are formed across the lower or inner fiat face of thering and ot a depth to merge with the annular or circumferentiallyextending groove 7 in the outer circular face of the ring. The passages8 are desirably comparatively shallow, on which account the groove 7 ismuch nearer the lower fiat face of the ring than the other flat face.The groove 7 and passages 8 drain 'oil to the interior of the ring. Theoil is spread in the downward'movemcnt of the piston. by the lower outercorner of the ring so that the groove 7 is only required to take care ata comparatively small quantity of oil. The drains 8 being on the lowerface of the ring, will-carry away a certain amount of oil; which willreduce the amount which the grooves 7 has to carry and will alsonaturally drain the oil that has been collected in the roove. A broadface 9 of the ring prefer.%ly remains in the zone of the passages El,insteadof a sharp scraping edge to prevent too severe removal of thelubricatlog oil. Moreover the groove is covered by the cylinder insteadof by a wall of the ring receiving groove in the piston to facilitatethe circulation of the 'oil, it being unneces saryto chamfer the pistonto afford access to the groove in the ring. The construction of myinvention is thus an improvement in imgortant particulars 'over priordevices.

hanges may be'made without departing from my invention.

Having thus ,de'cribedniy invention, I claim k 1. Thecombination with ahollow piston formed with a pistonring receiving groove and havingpassagesestablishing communication between the piston interior and saidgroove; and a istfon ring occupying said groove and having an externalcircumferentially extending groove in its outer circular faceand in azone between and spaced apart from theflat faces of the ring, said ringalso having passages formed in and extending too across. one flat-faceof the ring and of a tially extending groove in its outer circular 10'depth to merge with the aforesald groove in face and in a zone betweenthe fiat faces of the ring. l the ring, said ring also having passages1' 2 The combination with a hollow piston formed in and extending acrossone flat face formed with 1; piston {in receiving groove of the ring andof a depth to merge with and having passhges est lishing communitheaforesald groove in the ring. 15 cation between the piston interior andsaid In witness whereof, I hereunto subscribe groove; and a, piston ringoccupying said my name.

groove and having an extex nal circumferen- DANIEL C. TEETOR.

